Generation loss was a major consideration in complex analog audio and video editing, where multi-layered edits were often created by making intermediate mixes which were then "bounced down" back onto tape. Repeated conversion between analog and digital can also cause loss. Poorly adjusted distribution amplifiers and mismatched impedances can make these problems even worse. In analog systems (including systems that use digital recording but make the copy over an analog connection), generation loss is mostly due to noise and bandwidth issues in cables, amplifiers, mixers, recording equipment and anything else between the source and the destination. File size increases are a common result of generation loss, as the introduction of artifacts may actually increase the entropy of the data through each generation. Anything that reduces the quality of the representation when copying, and would cause further reduction in quality on making a copy of the copy, can be considered a form of generation loss. Generation loss is the loss of quality between subsequent copies or transcodes of data. Digital generation loss induced by rotating a JPEG image 90 degrees (from top to bottom) 0, 100, 200, 500, 900, and 2000 times (without using lossless tools)
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